package com.shop.shoppingmall.util;

import com.shop.shoppingmall.entity.BaiDu;
import net.sf.json.JSONObject;

import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.URL;
import java.util.List;
import java.util.Map;

/**
 * 获取token类
 */
public class TokenUtil {

    String authHost = "https://aip.baidubce.com/oauth/2.0/token?";

    /**
     * token 到期时间
     */
    public static long tokenTime = 0L;
    /**
     * token
     */
    public static String access_token;

    public String token(){
        BaiDu baiDu = new BaiDu();
        String clientId = baiDu.getClient_id();
        String clientSecret = baiDu.getClient_secret();
        System.out.println(clientId+"-----------------"+clientSecret);
        String getAccessTokenUrl = authHost
                // 1. grant_type为固定参数
                + "grant_type=client_credentials"
                // 2. 官网获取的 API Key
                + "&client_id=" + clientId
                // 3. 官网获取的 Secret Key
                + "&client_secret=" + clientSecret;

        try {
            URL realUrl = new URL(getAccessTokenUrl);
            // 打开和URL之间的连接
            HttpURLConnection connection = (HttpURLConnection) realUrl.openConnection();
            connection.setRequestMethod("POST");
            connection.connect();
            // 获取所有响应头字段
            Map<String, List<String>> map = connection.getHeaderFields();
            // 遍历所有的响应头字段
            for (String key : map.keySet()) {
                System.err.println(key + "--->" + map.get(key));
            }
            // 定义 BufferedReader输入流来读取URL的响应
            BufferedReader in = new BufferedReader(new InputStreamReader(connection.getInputStream()));
            String result = "";
            String line;
            while ((line = in.readLine()) != null) {
                result += line;
            }
            /**
             * 返回结果示例
             */
            System.err.println("result:" + result);
            JSONObject jsonObject = JSONObject.fromObject(result);
            String expires_in = jsonObject.getString("expires_in");
            // token
            access_token = jsonObject.getString("access_token");
            // 过期时间
            tokenTime = System.currentTimeMillis() + Long.valueOf(expires_in);
            return access_token;
        } catch (Exception e) {
            System.err.printf("获取token失败！");
            e.printStackTrace(System.err);
        }
        return null;
    }

}
